错误
TypeError: recv_thread() argument after * must be an iterable, not socket的问题。
原因
这个错误是由于在创建一个线程时，将socket对象作为args参数传递给了recv_thread函数，而args参数需要一个可迭代的对象，比如元组或列表。
解决办法
可以通过在socket对象后面加一个逗号，将其转换为一个元组，来解决这个问题。代码是这样的：
def recv_thread(sock):
while True:
data = sock.recv(1024).decode()
thread = threading.Thread(target=recv_thread, args=(s))
可以改为：
def recv_thread(sock):
while True:
data = sock.recv(1024).decode()
thread = threading.Thread(target=recv_thread, args=(s,))
这样就可以避免TypeError: recv_thread() argument after * must be an iterable, not socket的错误了。
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